Postal Experiment: What happens when you mail two envelopes full of crackers to yourself? March 20, 2011 Postal Experiment: What happens when you mail two envelopes full of crackers to yourself – one marked “Fragile,” the other marked “Handle Carelessly?” Answer here. Personal postal experiment regrets: I never did try affixing postage to a Taco Bell Chicken Quesadilla envelope. Perhaps soon.